This appears to be the real maximum of a file size handled by Content Manager, and it's with this reason we tend to keep stuff a lot smaller so as to ensure we don't run into this limit. At least the limit is now over 1 GB. In TS12 Content Manager would crash the desktop without warning when attempting to import a file above 750 MB.
Anyway... Does your CDP contain just the route, or is that content as well?
If it contains both, split out your CDP so that it's the route in one CDP with sessions in another, and content in another. It may also require saving multiple smaller CDPs, which is better anyway for content installation, because it's easier to handle